Eccentric definitions

ĭk-sĕn'trĭk, ĕk-
The definition of eccentric is something that is not exactly circular.

An example of eccentric is the orbit of Mercury.

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Departing from a recognized, conventional, or established norm or pattern.
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Deviating from a circular form or path, as in an elliptical orbit.
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Eccentric is defined as someone or something that is different or behaves in an unconventional way.

An example of eccentric is an adult wearing footy pajamas to a formal dinner.

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Not having the same center.

Eccentric circles.

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Having the axis located elsewhere than at the geometric center.
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One that deviates markedly from an established norm, especially a person of odd or unconventional behavior.
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A disk or wheel having its axis of revolution displaced from its center so that it is capable of imparting reciprocating motion.
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Not having the same center, as two circles one inside the other.
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Not having the axis exactly in the center; off-center.

An eccentric wheel.

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Not exactly circular in shape or motion.
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Deviating from the norm, as in conduct; odd; unconventional.
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A disk set off center on a shaft and revolving inside a strap that is attached to one end of a rod, thereby converting the circular motion of the shaft into back-and-forth motion of the rod.
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An odd or unconventional person.
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Elliptical or off-center, rather than perfectly circular with a precisely centered axis. Eccentricities in the core of an optical fiber can cause signal attenuation and distortion.
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A euphemism for someone who is crazy and rich, as opposed to being just plain crazy like the rest of us.
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Not at or in the centre.
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An eccentric or elliptical orbit.

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Having a different center; not concentric.
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(of a person) Deviating from the norm; behaving unexpectedly or differently.

"The recluse has become really eccentric over the years."

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(physiology) (of a motion) Against or in the opposite direction of contraction of a muscle. (E.g. flexion of the lower arm (bending of the elbow joint) by an external force while contracting the triceps and other elbow extensor muscles to control that movement; opening of the jaw while flexing the masseter).

Antonym: concentric. Both concentric and eccentric are collectively referred to as isotonic, the antonym of which is isometric.

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Not having the same goal or motive.
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One who does not behave like others.
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A disk or wheel with its axis off centre, giving a reciprocating motion.
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(slang) A kook.
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Origin of eccentric

Middle English eccentrik planetary orbit of which the earth is not at the center from Medieval Latin eccentricus not having the same center from Greek ekkentros ek- out of ecto– kentron center (from kentein to prick kent- in Indo-European roots)